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dadeprettodadepretto
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Implement Day018
1 parent 858f4f9 commit 8e3c3bf

11 files changed

+193
-1
lines changed

‎DailyCodingSolutions.sln

+16
Original file line numberDiff line numberDiff line change
@@ -105,6 +105,12 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Day017", "Day017\Day017.csp
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Day017.Test", "Day017.Test\Day017.Test.csproj", "{1B34914A-05D8-4107-A48A-54092F6788CC}"
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EndProject
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Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Day018", "Day018", "{E45179C1-4656-439A-A77F-9019B38A09E1}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Day018", "Day018\Day018.csproj", "{4CEC2A44-690C-4271-8ECD-AF268FD611FC}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Day018.Test", "Day018.Test\Day018.Test.csproj", "{5B7BD630-F10B-45A1-BB83-00D5C3C84AAD}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
@@ -148,6 +154,8 @@ Global
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{AD4EABC8-21ED-4EB2-BA80-84B821DEC22D} = {906AF173-B3C4-41F6-89D0-15BEA3A5B628}
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{6F837E67-D8AB-410F-A50E-F77A4619D4FC} = {0446A598-9610-4DE6-B83D-490056506F0E}
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{1B34914A-05D8-4107-A48A-54092F6788CC} = {0446A598-9610-4DE6-B83D-490056506F0E}
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{4CEC2A44-690C-4271-8ECD-AF268FD611FC} = {E45179C1-4656-439A-A77F-9019B38A09E1}
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{5B7BD630-F10B-45A1-BB83-00D5C3C84AAD} = {E45179C1-4656-439A-A77F-9019B38A09E1}
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{A8D06C50-49F9-4BC0-A128-D6A85B6DBB21}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
@@ -286,5 +294,13 @@ Global
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{1B34914A-05D8-4107-A48A-54092F6788CC}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{1B34914A-05D8-4107-A48A-54092F6788CC}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{1B34914A-05D8-4107-A48A-54092F6788CC}.Release|Any CPU.Build.0 = Release|Any CPU
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{4CEC2A44-690C-4271-8ECD-AF268FD611FC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{4CEC2A44-690C-4271-8ECD-AF268FD611FC}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{4CEC2A44-690C-4271-8ECD-AF268FD611FC}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{4CEC2A44-690C-4271-8ECD-AF268FD611FC}.Release|Any CPU.Build.0 = Release|Any CPU
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{5B7BD630-F10B-45A1-BB83-00D5C3C84AAD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{5B7BD630-F10B-45A1-BB83-00D5C3C84AAD}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{5B7BD630-F10B-45A1-BB83-00D5C3C84AAD}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{5B7BD630-F10B-45A1-BB83-00D5C3C84AAD}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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EndGlobal

‎DailyCodingSolutions.sln.DotSettings.user

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@@ -1,6 +1,6 @@
11
<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
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<s:String x:Key="/Default/Environment/Highlighting/HighlightingSourceSnapshotLocation/@EntryValue">/Users/davidedepretto/Library/Caches/JetBrains/Rider2021.3/resharper-host/temp/Rider/vAny/CoverageData/_DailyCodingSolutions.1584796420/Snapshot/snapshot.utdcvr</s:String>
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<s:String x:Key="/Default/Environment/UnitTesting/UnitTestSessionStore/Sessions/=426eb0ab_002Db449_002D43b0_002Dbd5f_002D231eb60b0710/@EntryIndexedValue">&lt;SessionState ContinuousTestingMode="0" IsActive="True" Name="Session" xmlns="urn:schemas-jetbrains-com:jetbrains-ut-session"&gt;
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<s:String x:Key="/Default/Environment/UnitTesting/UnitTestSessionStore/Sessions/=f79e0671_002Ddf0b_002D41e3_002D9f2f_002D764725835cc0/@EntryIndexedValue">&lt;SessionState ContinuousTestingMode="0" IsActive="True" Name="All tests from &amp;lt;Day018&amp;gt;" xmlns="urn:schemas-jetbrains-com:jetbrains-ut-session"&gt;
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&lt;Or&gt;
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&lt;Project Location="/Users/davidedepretto/GitHub/daily-coding-solutions" Presentation="&amp;lt;Day001&amp;gt;" /&gt;
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&lt;Project Location="/Users/davidedepretto/GitHub/daily-coding-solutions" Presentation="&amp;lt;Day002&amp;gt;" /&gt;
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&lt;Project Location="/Users/davidedepretto/GitHub/daily-coding-solutions" Presentation="&amp;lt;Day015&amp;gt;" /&gt;
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&lt;Project Location="/Users/davidedepretto/GitHub/daily-coding-solutions" Presentation="&amp;lt;Day016&amp;gt;" /&gt;
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&lt;Project Location="/Users/davidedepretto/GitHub/daily-coding-solutions" Presentation="&amp;lt;Day017&amp;gt;" /&gt;
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&lt;Project Location="/Users/davidedepretto/GitHub/daily-coding-solutions" Presentation="&amp;lt;Day018&amp;gt;" /&gt;
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&lt;/Or&gt;
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&lt;/SessionState&gt;</s:String>
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@@ -40,6 +41,7 @@
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<s:Boolean x:Key="/Default/UserDictionary/Words/=aaaaa/@EntryIndexedValue">True</s:Boolean>
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<s:Boolean x:Key="/Default/UserDictionary/Words/=abcba/@EntryIndexedValue">True</s:Boolean>

‎Day018.Test/Day018.Test.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net6.0</TargetFramework>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
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<PackageReference Include="xunit" Version="2.4.1" />
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<PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageReference>
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<PackageReference Include="coverlet.collector" Version="3.1.0">
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageReference>
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\Day018\Day018.csproj" />
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</ItemGroup>
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</Project>

‎Day018.Test/Strategy1Test.cs

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namespace Day018.Test;
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public class Strategy1Test : StrategyTestBase
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{
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public Strategy1Test() : base(new Strategy1())
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{
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}
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}

‎Day018.Test/Strategy2Test.cs

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namespace Day018.Test;
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public class Strategy2Test : StrategyTestBase
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{
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public Strategy2Test() : base(new Strategy2())
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{
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}
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}

‎Day018.Test/StrategyTestBase.cs

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using System.Collections.Generic;
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using Xunit;
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namespace Day018.Test;
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public abstract class StrategyTestBase
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{
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private readonly IStrategy _strategy;
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protected StrategyTestBase(IStrategy strategy)
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{
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_strategy = strategy;
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}
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[Theory]
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[InlineData(new[] {10, 5, 2, 7, 8, 7}, 1, new[] {10, 5, 2, 7, 8, 7})]
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[InlineData(new[] {10, 5, 2, 7, 8, 7}, 2, new[] {10, 5, 7, 8, 8})]
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[InlineData(new[] {10, 5, 2, 7, 8, 7}, 3, new[] {10, 7, 8, 8})]
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[InlineData(new[] {10, 5, 2, 7, 8, 7}, 4, new[] {10, 8, 8})]
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[InlineData(new[] {10, 5, 2, 7, 8, 7}, 6, new[] {10})]
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[InlineData(new[] {1, 1, 1, 1, 1, 1}, 1, new[] {1, 1, 1, 1, 1, 1})]
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[InlineData(new[] {1, 1, 1, 1, 1, 1}, 2, new[] {1, 1, 1, 1, 1})]
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[InlineData(new[] {1, 1, 1, 1, 1, 1}, 3, new[] {1, 1, 1, 1})]
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[InlineData(new[] {1, 1, 1, 1, 1, 1}, 6, new[] {1})]
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[InlineData(new[] {1, 2, 3, 10, 2, 5, -4, -7, -2, 10}, 3,
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new[] {3, 10, 10, 10, 5, 5, -2, 10})]
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public void Execute_GivenIntArrayAndSubsetLength_ReturnsMaxOfRollingSubsets(
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int[] inputList, int subsetLength, int[] expected)
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{
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var actual = new List<int>();
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_strategy.Execute(inputList, subsetLength, actual);
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Assert.Equal(expected, actual);
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}
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}

‎Day018/Day018.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net6.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>

‎Day018/IStrategy.cs

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namespace Day018;
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public interface IStrategy
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{
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void Execute(
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IReadOnlyList<int> inputList,
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int subsetLength,
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IList<int> output);
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}

‎Day018/README.md

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# Day 18
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Given an array of integers and a number k, where 1 <= k <= length of the array,
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compute the maximum values of each subarray of length k.
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For example, given array = `[10, 5, 2, 7, 8, 7]` and k = 3, we should
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get: `[10, 7, 8, 8]`, since:
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- 10 = max(10, 5, 2)
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- 7 = max(5, 2, 7)
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- 8 = max(2, 7, 8)
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- 8 = max(7, 8, 7)
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Do this in O(n) time and O(k) space. You can modify the input array in-place and
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you do not need to store the results. You can simply print them out as you
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compute them.

‎Day018/Strategy1.cs

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namespace Day018;
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/**
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* This is not in O(n) time and O(k) space, but it's just a first approximation
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* to validate unit tests and understand the general problem
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*/
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public class Strategy1 : IStrategy
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{
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public void Execute(
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IReadOnlyList<int> inputList,
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int subsetLength,
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IList<int> output)
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{
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var inputArray = inputList as int[] ?? inputList.ToArray();
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for (var i = 0; i <= inputArray.Length - subsetLength; i++)
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output.Add(inputArray[i..(i + subsetLength)].Max());
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}
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}

‎Day018/Strategy2.cs

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namespace Day018;
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/**
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* This is shoudl be in O(n) time and O(k) space, but I'm not sure TBH because
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* of those nested while loops.. 🧐
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*/
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public class Strategy2 : IStrategy
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{
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public void Execute(
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IReadOnlyList<int> inputList,
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int subsetLength,
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IList<int> output)
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{
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var indexes = new LinkedList<int>();
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for (var i = 0; i < subsetLength; ++i)
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{
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while (indexes.Count > 0 &&
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inputList[i] >= inputList[indexes.Last!.Value])
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indexes.RemoveLast();
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indexes.AddLast(i);
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}
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output.Add(inputList[indexes.First!.Value]);
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for (var i = subsetLength; i < inputList.Count; ++i)
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{
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while (indexes.Count > 0 &&
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indexes.First.Value <= i - subsetLength)
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indexes.RemoveFirst();
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while (indexes.Count > 0 &&
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inputList[i] >= inputList[indexes.Last!.Value])
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indexes.RemoveLast();
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indexes.AddLast(i);
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output.Add(inputList[indexes.First.Value]);
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}
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}
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}

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